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Compressive Strength, is the force necessary to produce a 25% (or any givenpercentage) compression over the entire top area of the foam specimen.


Calculate the 25% compression deflection force, per unit area of

specimen, expresssed as kilopascals (or pound-force per square inch),
as follows:

CD = F / A

CD = compression deflection force per unit of specimen area, kPa (psi).
F = force required to compress the specimen 25% of the thickness as measured.
N (lbf).
A = specimen compression contast surface area, m^2 (in^2).